To make the fundraiser creation flow smoother we skipped the Thank You page, and that makes it difficult to track as a goal in Google Analytics. But you can easily track it by creating virtual pageviews that will send hits to Google Analytics when a fundraiser is created.
Create a tag to track virtual pageviews with the following setup:
Tag Type: Google Analytics
Track Type: Page View
Check Enable overriding this tag
Fields to Set:
Field Name: Page - Value: virtual/fundraiser-created
Field Name: Title - Value: Fundraiser Created
Navigate to Triggers and create a trigger for this tag with the following configuration:
Trigger Type: Element Visibility
Selection Method: ID
Element ID: analytics-fundraiser-created
When to fire this trigger: Once per event
This trigger fires on: Page Path
Reference to this trigger: Tag Virtual Pageview
Publish the changes and test the tag with the GTM preview and Google Analytics Realtime Overview.
Create the Goal in Google Analytics. You can also create a funnel to track conversion over the fundraiser creation flow.